Factors affecting photosynthesis Quiz
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5 questions, one answer each
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1. Which factor is most likely to limit photosynthesis at night?
- A. Carbon dioxide
- B. Oxygen
- C. Chlorophyll
- D. Light intensity
2. The rate of photosynthesis falls sharply at 55 °C. Why?
- A. The enzymes are denatured
- B. There is too much light
- C. The plant has used all the oxygen
- D. Chlorophyll absorbs less carbon dioxide
3. A lamp is moved from 40 cm to 10 cm from pondweed. What happens to the bubbles per minute?
- A. They decrease
- B. They stay the same
- C. They increase
- D. They stop
4. A plant lacking magnesium has yellow leaves. Why does it photosynthesise slowly?
- A. It has too much carbon dioxide
- B. It makes less chlorophyll to absorb light
- C. The leaves are too warm
- D. It releases too much oxygen
5. A graph shows a plateau as light intensity increases. Which statement is correct?
- A. Another factor is now limiting the rate
- B. Light has stopped reaching the leaf
- C. Photosynthesis has stopped
- D. The enzymes have been denatured